JVC XV-M565BK Service Manual page 27

4. Microcomputer Volume
Processing of Each Microcomputer
* IC701 System microcomputer (sub-microcomputer)
After powering on, this microcomputer is continuously activated to control keys and remote control
signals.
According to key operations or remote control signals, it controls (turns on/off) the power for
LSIs including IC401 (main microcomputer) and the audio/video output circuit.
It also controls the resetting of the main microcomputer, FL driver IC (IC802) for FL display.
IC401 Main microcomputer
* This microcomputer controls a group of LSIs of servo and signal processing sections according to
commands from the system microcomputer.
After receiving time information from the signal processing section, it transmits the information
together with the status to the system microcomputer.
It controls the resetting of the LSIs of the servo and signal processing sections.
It has IC402 (16Mbit ROM) as an external ROM.
Normal Starting Conditions
* IC701 System microcomputer
(1) +5V must be applied to "11" and "100".
(2) Oscillators of "12" and "13" must be oscillating correctly.
(3) Input to "33" (RESET) must be at +5V (reset cancel).
If above (1) to (3) are not satisfied when the STANDBY indicating lamp does not light at
power-on, IC701 may be defective.
* IC401 Main microcomputer
(1) +5V must be applied to "17","22","34","54","66","83"
(2) Clock signal (13.5MHz) must be input to "23".
(3) Input to "82" (RST) must be at +5V (reset cancel).
(4) Communication line with IC701 ("57","58,"67"~"69") and that with IC402 (external ROM)
("13"~"16","26"~"33","35"~"42","44","93"~"100") must work normally.
If above (1) to (3) are not satisfied when the STANDBY indicating lamp goes out but FL does not
light when the POWER switch is turned on, IC401, IC701 or IC402 may be defective.
XV-M565BK/M567GD
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